BartPE (Bart's Preinstalled Environment) is a Live CD version of the Microsoft Windows XP or Windows Server 2003 operating systems. BartPE allows a user to boot Windows XP/Windows Server 2003 from a CD-ROM regardless of the condition of the installed operating systems on the internal hard drive. This means that the user can, for instance, recover data from a failed operating system installation, or reset a lost administrator password. A user can create his or her own installation of BartPE using the installation disk of the operating system in question and the program PE-Builder, programmed by Bart Lagerweij.